------------------------<snip>----------------------
Correct. For an amode24 program, the entire universe ends at address
x'00FFFFFF'; the "next step" wraps back to x'00000000'. So for an
amode24 program, there is nothing "above the line" or "above the bar"
because for it, there is neither a "line" nor a "bar".
That's also my understanding.
So, again, why 24-bit programs could be a reason for 2-4G hole ?
-------------------------<unsnip>--------------------------
Because bit 0 is the switch between 24-bit mode and 31-bit mode, and as
such cannot participate in an address.
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